10 'Green' Tech Products To Celebrate On Earth Day

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Unlike most alarm clocks, which rely on batteries or outlets to tick and tock, a unique design from Bedol needs only tap water to keep the time.

Bedol’s Drop Water Clock -- which, fittingly, is shaped like a raindrop -- is powered entirely by water. The water needs to be replaced every six months, but users can rest assured that a built-in memory chip will keep track of the time. Like most alarm clocks, it features daily and hourly alarm options and can be set as a 12- or 24-hour display.